During World War II, Operation Sealion was the codename for the invasion of which area?

Question

Where was the landing of the main invasion force on the Italian peninsula in World War II by the allied army (comprising the U.S. Fifth Army and the British Eighth Army) on 9 September 1943?

Answer 1

Britain
Hitler had hoped to launch Sealion after the Battle of Britain, but things did not turn out as planned....